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Old 05-30-2017, 05:14 PM
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Default Scout 800 running hot

I finally got my scout insured and registered again. This is the one that had the 4 cylinder and I swapped it for an IH 345. Took it for a 20 Knute drive. And it gradually heats up by the time I get back. It has a brand new 24"x19" aluminum 2" thick core, mechanical fan, no clutch. The first drive it did not have a shroud. I built a shroud, while not perfect and will undergo a refit, should do the job. Also checked the timing, was at about 5* before, I adjusted back to zero. Has an edelbrock 1406, that I swapped all the original size jets and rods into (after the first trip), and fixed a minor vacuum leak. Water pump is flowing good. I pulled the new Robert Shaw original style T stat and verified operation in boiling water.

It was a bit better on the second trip, but still starting to get pretty hot by the time I got back. It does not cool back down while idling either.

My suspicion is that it is not getting good air flow because of the AC condenser (which is not yet hooked up). I had a similar issue with the 4 cylinder not cooling after the condenser was installed. I am considering pulling out the condenser, and seeing if it will run cooler, which I suspect it will. If that is the case, any ideas for options? I can install a 4" wider radiator, but will that fix the problem after the condenser is installed? Considered running twin condensers with fans on either side of the radiator similar to a Porsche boxt, but would rather have just one if I can do it.

Any thoughts would be appreciated.
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Old 05-30-2017, 05:26 PM
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Shroud needs to be as close to the blade tipsas possible. 1/2" at most. Fan should also be mostly in the shroud, with shroud tight fitting to the radiator. With the change in engines, was there a pulley change that slowed down the fan? Myself, I prefer a clutch. I'm not a fan of the aftermarket flex fans. I'm assuming too that the fan is spinning the correct direction to be a puller. Just throwing things out there.

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Old 05-30-2017, 07:33 PM
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Unfortunately there is no room for a clutch. It is not a flex fan. I will look into pulley diameter. The fan is definitely pulling, it is a 6 blade.
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Old 05-30-2017, 07:55 PM
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You might consider adding an oil cooler to help spread the engine cooling load.
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Old 05-30-2017, 08:08 PM
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Andy, when Ron toiled for 3 days reorganizing forums last year one of the intentions was to put everything automotive, mechanical or electrical in the new forum named Mechanical & Electrical. .
And to keep them out of Off Topics.

So I am moving your thread there.
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Old 05-30-2017, 08:31 PM
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Just throwing this out there, if a fan is put on backwards it will still pull but not as efficient.
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Old 05-30-2017, 09:25 PM
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Thanks cutter, was not sure where it should go.

I checked the pulley size on another V8 scout, same size.

Digr, I will check that out.
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Old 05-30-2017, 09:45 PM
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Some how the timing doesn't sound correct. If it is late it will cause heating. Try advancing the timing, take it out and if you get pinging, and back it off a bit.
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Old 05-31-2017, 06:41 AM
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Could the lower hose be collapsing?
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Old 05-31-2017, 07:52 AM
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IH motors don't like advance, factory spec is 0* at idle. I am suspicious of too much overall advance, but can't figure out a way to measure it yet, and have to figure out how to adjust the vacuum can.
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